And you can buy the large potty pads (for humans) at Sam's Club for alot less $$$$ if you decide you want to train for mostly indoor pottying.
I started with a child's play pen I got at a yard sale for $5 - made 1/2 side to play and the other side put the potty pad. Similar to what has been mentioned earlier.
__________________ .  Cali  , and Cali's keeper and staff, Jay No, not a "mini" Yorkie - She loves to motor in her Mini Cooper car |